62% (1983)

50% (1992)

68% (1971)

65% (1958)

61% (1979)

66% (1969)

66% (1980)

67% (1978)

65% (1967)

64% (1986)

71% (1960)

70% (1959)

52% (1996)

70% (1978)

59% (1979)

46% (1976)

61% (1994)

66% (1966)

68% (1959)

60% (1974)